Ricoh B089 Service Manual page 717

SERVICE RAM ADDRESSES
680482(H) - Transmission monitor volume 00 - 07(H)
680483(H) - Reception monitor volume 00 - 07(H)
680484(H) - On-hook monitor volume 00 - 07(H)
680485(H) - Dialing monitor volume 00 - 07(H)
680486(H) - Buzzer volume 00 - 07(H)
6BA000 – 6BA1FF(H) – Latest 64 error codes (Read only)
6BE988 – 6BF35F(H) – Latest 20 error communication records
SM 3-77 B576